Japan's industrial output in December grew a seasonally adjusted 0.9 percent from the previous month, revised downward from the initially reported 1.1 percent increase, the Ministry of Economy, Trade and Industry said Monday.

The ministry attributed the downgrade to fresh or additional data on medical goods and bridges that were not available when the preliminary report was issued Jan. 31.

The index of output at factories and mines came to 100.1 against the base of 100 for 2010.

The index of industrial shipments was revised upward, posting a 0.8 percent rise against an initially reported increase of 0.6 percent. The industrial inventories index was down 0.5 percent against an initially reported 0.4 percent decline.